Chapter 31: The Urinary System
Chapter 32: Defenses Against Disease
Chapter 33: Chemical Control of the Animal Body: The Endocrine System
Chapter 34: The Nervous System and the Senses
Chapter 35: Action and Support: The Muscles and Skeleton
Chapter 36: Animal Reproduction
Chapter 37: Animal Development
Chapter 38: Animal Behavior
Chapter 39: Population Growth and Regulation
Chapter 40: Community Interactions
Chapter 41: How Do Ecosystems Work?
Chapter 42: Earth's Diverse Ecosystems
